#include <iostream>
#include <cmath>

using namespace std;

int main(){

	double pi = 3.1415926;
	double v;
	int h , r , a;
	cin >> h >> r;
	v = h * pi * pow(r,2);
	a = ceil((20*1000) / v);
	cout << a << endl;

    return 0;
}
